<!DOCTYPE html>
<p>PASS if no crash or assertion failure.</p>
<ruby style="display:block;">
    <rt>&nbsp;</rt>
    <div style="height:50%;"></div>
    <rt id="elm" style="display:none;">&nbsp;</rt>
    &nbsp;
</ruby>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
    document.body.offsetTop;
    document.getElementById("elm").style.display = "block";
</script>
